JWT Pop Chargers for the 2003-2006 350Z. POP-Charger air filters are designed for maximum air flow by using a 6″ diameter venturi surrounded by an oiled gauze filter element. The filter element is reusable after cleaning and reapplying filter oil. POP-Charger aluminum venturis are made from lightweight cast aluminum and CNC machined by us to ensure a quality fit. Product comes with Intake, Adapter, Heat Shield, and Bracket. HP Gains are around 11-12 at Crank, and 6-7 RWHP, and you’ll notice a nice new aggressive sound from the engine.